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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6685) Change the generic serialization framework API to use serialization-specific bytes instead of Map<String,String> for configuration
Date Wed, 21 Apr 2010 22:14:51 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12859550#action_12859550
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Doug Cutting commented on HADOOP-6685:
--------------------------------------

Different serializations currently use common keys to share parts of their configuration data.
 For example, many name a class that implements the serialization.  Several name a class that
represents the instances.  The code that accesses these properties is shared, either through
a common base class or a utility class.

Binary blobs can also be considerably more fragile than a Map<String,String>.  If we
wish the versions of clients and servers to be able to vary, then blobs stored in configurations
must be version-tolerant, i.e., written and read with a fairly sophisticated serialization
system.

> Change the generic serialization framework API to use serialization-specific bytes instead
of Map<String,String> for configuration
> ----------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-6685
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6685
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>
> Currently, the generic serialization framework uses Map<String,String> for the
serialization specific configuration. Since this data is really internal to the specific serialization,
I think we should change it to be an opaque binary blob. This will simplify the interface
for defining specific serializations for different contexts (MAPREDUCE-1462). It will also
move us toward having serialized objects for Mappers, Reducers, etc (MAPREDUCE-1183).

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